[Ambedo.]

Your period actually doesn't stop while you're in the water. I know it's a bit awkward, but you're gonna have to let your mom know that you started your period and ask her to buy tampons or if she has any at the house that you can use for your swim lesson. Also, if this is your first time using tampons, be aware that it might feel a bit awkward at first. That feeling will go away though, so don't worry about it too much.